Center for Regional Environmental Research, National Institute for Environmental Studies (NIES), 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan.
Department of Integrated Science and Engineering for Sustainable Society, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan.
Int J Environ Res Public Health. 2019 May 30;16(11):1907. doi: 10.3390/ijerph16111907.
We investigated the adsorption characteristics of geosmin and 2-methylisoborneol (MIB) on graphene oxide (GO) in the absence and presence of natural organic matter (NOM). The graphene oxide had fast adsorption kinetics for both compounds because of its open-layered structure, with adsorption equilibrium being achieved within 15 min of contact. Although NOM did not affect the adsorption of geosmin on GO, it delayed that of MIB, probably because of competition for adsorption sites. The adsorption isotherms show that GO had a greater capacity for geosmin adsorption than for MIB because geosmin was more hydrophobic. Moreover, NOM interfered with the adsorption of MIB onto the GO, but increased the amount of adsorbed geosmin, which likely occurred because NOM increased the dispersibility of GO, which then increased the number of GO adsorption sites. The difference in the effects of NOM on GO adsorption of geosmin and MIB may be explained by their hydrophobicity. Although the adsorption of geosmin and MIB by GO was fast, its capacity to adsorb both compounds was substantially lower than that of activated carbon because of its higher hydrophilicity.
我们研究了在不存在和存在天然有机物（NOM）的情况下，氧化石墨烯（GO）对土臭素和 2-甲基异莰醇（MIB）的吸附特性。由于其开放式结构，氧化石墨烯对这两种化合物都具有快速的吸附动力学，接触 15 分钟内即可达到吸附平衡。尽管 NOM 不影响土臭素在 GO 上的吸附，但它会延迟 MIB 的吸附，这可能是因为竞争吸附位点。吸附等温线表明，GO 对土臭素的吸附容量大于对 MIB 的吸附容量，因为土臭素的疏水性更强。此外，NOM 会干扰 MIB 被吸附到 GO 上，但会增加被吸附的土臭素的量，这可能是因为 NOM 增加了 GO 的分散性，从而增加了 GO 的吸附位点数量。NOM 对 GO 吸附土臭素和 MIB 的影响不同，可能是由于它们的疏水性不同。尽管 GO 对土臭素和 MIB 的吸附速度很快，但由于其较高的亲水性，其吸附这两种化合物的能力远低于活性炭。
